Product Overview

ManualsBrandsCaleffi ManualsAir Eliminators1-1/4" NPT External 3+1 Hydraulic Separator & Manifold HydroLink

Operating principle

When a system contains a primary boiler circuit with its own pump

and a secondary distribution circuit with one or more distribution

pumps, operating conditions may arise in the system where the

pumps interact. This can create abnormal variations in ﬂow rates and

pressures in the circuits.

The HydroLink™ provides a separation chamber on the left side of

the unit to hydraulically separate the boiler circuit from the distribution

circuits: the ow in one circuit does not create a ow in the

other if the pressure loss in the common section is negligible.

This chamber is separated from the manifold chambers by a baffle

plate with two closely spaced openings which, given their size

and placement, act similarly to a pair of closely spaced tees. This

eliminates any significant pressure differential between the upper and

lower manifold chambers that comprise a self-contained manifold

station with up to four independently controlled load circuits delivering

the same supply temperature.

Three possible hydronic balance situations are shown below as

examples.

Gprimary = Gsecondary (G

) Gprimary > Gsecondary (G

) Gprimary < Gsecondary (G

)

primary circuit

secondary circuit

Installation

HydroLink™ units should be installed in accordance with the diagrams

shown in this brochure, ensuring the correct connection of the supply

and return piping and the main (primary) and branch (secondary)

connections. HydroLink™ units can even be installed upside down as

long as the connection logic shown is followed and the air vent and

drain valve are swapped.

The 1/2” NPT female connections must only be used for connecting

an air vent and drain valve (provided with the HydroLink™ assembly)

and not for connecting branch circuits.

Insulation

The Hydrolink™ is supplied with heat-preformed shell insulation. This

provides heat insulation and a sealing affect that prevents atmospheric

water vapor from entering the unit. For this reason, the insulated

HydroLink™ assembly may also be used in cooling water circuits,

as it prevents condensation from forming on the surface of the body.

Support brackets

The HydroLink™ 2+2 and

3+1 models are supplied

complete with suitable

wall-mounting brackets,

making it easy to adjust for

front-to-back positioning.